Comparison : Item # M24-1, Oxygen Diameter Index Safety System (DISS) 1240, 11/16 Inch (in) Hex Nut
Item # M24-2, Oxygen Diameter Index Safety System (DISS) 1240, Knurled Hand Tight Nut
Item # M24-2P, Oxygen Diameter Index Safety System (DISS) 1240, Hand Tight with Green Collar Nut
Item # M24-2PW, Oxygen Diameter Index Safety System (DISS) 1240, Hex Hand Tight Nut with White Collar
Item # M24-33, Oxygen Diameter Index Safety System (DISS) 1240, F x 1/4 Inch (in) National Pipe Thread (NPT) Male Nut